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A third title bout added to Mayweather-Alvarez card

A world championship bout was one of two fights added Thursday to the Sept. 14 Floyd Mayweather-Canelo Alvarez pay-per-view card, giving The One: Mayweather vs. Canelo three championship fights on one of the

A world championship bout was one of two fights added Thursday to the Sept. 14 Floyd Mayweather Jr.-Canelo Alvarez pay-per-view card, giving The One: Mayweather vs. Canelo three title fights on one of the biggest cards in years at the MGM Grand in Las Vegas.

In a 12-round battle for the IBF junior middleweight title, Las Vegas native Ishe Smith defends his crown for the first time against top contender Carlos Molina.

The opening bout on the Showtime PPV telecast (9 p.m. ET) will be a 10-round welterweight showdown between Mexico's Pablo Cesar Cano and England's Ashley Theophane.

In addition to the main event, a battle of unbeatens between Mayweather (44-0) and Saul "Canelo" Alvarez (42-0) for the WBC and WBA light middleweight titles at a catchweight of 152 pounds, the co-feature will pit undefeated WBC, WBA and Ring magazine junior welterweight titlist Danny "Swift" Garcia and power-punching Argentine and WBC interim 140-pound champion Lucas Matthysse.

The event sold out in less than 24 hours, and pay-per-view sales could threaten the record held by Mayweather for his 2007 title fight against Oscar De La Hoya, which drew 2.5 million buys.

Smith (25-5, 11 KOs), who starred in the reality TV show The Contender, put together a four-fight win streak starting in late 2010 that culminated in a 12-round decision win against Cornelius Bundrage on Feb. 23.

Mexico native Carlos Molina (21-5-2, 6 KOs) is finally getting his shot at a title. Molina, 30, began making noise with his disputed draw against Erislandy Lara in 2011, and he has since won four of five bouts, defeating former world champions Kermit Cintron and Cory Spinks. His only loss came on a controversial disqualification against James Kirkland in March 2012.

The 23-year-old Cano (26-3-1, 20 KOs), coming off controversial losses to Paulie Malignaggi and Shane Mosley, is fighting in Las Vegas for the first time since his classic 2011 battle with Mexican legend Erik Morales. Theophane (33-5-1, 10 KOs) is finally getting a shot on the world stage. A former British junior welterweight champion, Theophane has wins against Delvin Rodriguez and DeMarcus Corley, and he gave Garcia one of his toughest fights in 2010 before losing a split decision. He comes into this fight having won two in a row.